Prefer a canonical longitude representation

If -180 is given, use 180 instead. This is arbitrary, and could
be changed to -180 without consequences. But it lets each Geopoint
be uniquely defined if we except the North and South poles since
the longitude has no meaning there.

1 files changed, 2 insertions, 1 deletions

diff --git a/main/src/cgeo/geocaching/geopoint/Geopoint.java b/main/src/cgeo/geocaching/geopoint/Geopoint.java
index e82d547..37c9e16 100644
--- a/main/src/cgeo/geocaching/geopoint/Geopoint.java
+++ b/main/src/cgeo/geocaching/geopoint/Geopoint.java
@@ -30,7 +30,8 @@ public final class Geopoint
             throw new MalformedCoordinateException("malformed latitude: " + lat);
         }
         if (lon <= 180 && lon >= -180) {
-            longitude = lon;
+            // Prefer 180 degrees rather than the equivalent -180.
+            longitude = lon == -180 ? 180 : lon;
         } else {
             throw new MalformedCoordinateException("malformed longitude: " + lon);
         }